Question:
A crystalline solid $X$ reacts with $dil. HCl$ to liberate a gas $Y.Y$ decolourises acidified $KMnO_4$. When a gas $'Z'$ is slowly passed into an aqueous solution of $Y$, colloidal sulphur is obtained. $X$ and $Z$ could be, respectively
A crystalline solid $X$ reacts with $dil. HCl$ to liberate a gas $Y.Y$ decolourises acidified $KMnO_4$. When a gas $'Z'$ is slowly passed into an aqueous solution of $Y$, colloidal sulphur is obtained. $X$ and $Z$ could be, respectively
Updated On: May 15, 2024
- $Na_2SO_4,H_2S$
- $Na_2SO_4,SO_2$
- $Na_2S,SO_3$
- $Na_2SO_3,H_2S$
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The Correct Option is D
Solution and Explanation
$Na _{2} SO _{3}(X)$ reacts with dil. $HCl$ to liberate $SO _{2}$ gas $(Y)$.
This $SO _{2}$ gas decolourises acidified $KMnO _{4} .$ On passing $H _{2} S$ gas $(Z)$ into aqueous solution of $SO _{2}$ (i.e., $H _{2} SO _{3}$ ), colloidal sulphur is obtained.
Complete reactions are as follows
$\underset{\text{Purple}}{2KMnO_4} + 2H_2O + \underset{(Y)}{5SO_2} \longrightarrow K_2SO_4 + \underset{\text{Colourless}}{2MnSO_4} + 2H_2SO_4$
$H _{2} O +\underset{(Y)}{ SO _2} \longrightarrow \underset{\text{Aqueous solution of Y}}{H_2SO_3}$
$H _{2} SO _{3}+\underset{(Z)}{2 H _{2} S} \longrightarrow \underset{\text{Colloidal sulphur}}{2 S +3 H _{2} O}$
This $SO _{2}$ gas decolourises acidified $KMnO _{4} .$ On passing $H _{2} S$ gas $(Z)$ into aqueous solution of $SO _{2}$ (i.e., $H _{2} SO _{3}$ ), colloidal sulphur is obtained.
Complete reactions are as follows
$\underset{\text{Purple}}{2KMnO_4} + 2H_2O + \underset{(Y)}{5SO_2} \longrightarrow K_2SO_4 + \underset{\text{Colourless}}{2MnSO_4} + 2H_2SO_4$
$H _{2} O +\underset{(Y)}{ SO _2} \longrightarrow \underset{\text{Aqueous solution of Y}}{H_2SO_3}$
$H _{2} SO _{3}+\underset{(Z)}{2 H _{2} S} \longrightarrow \underset{\text{Colloidal sulphur}}{2 S +3 H _{2} O}$
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Concepts Used:
P-Block Elements
- P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
- P block elements are shiny and usually a good conductor of electricity and heat as they have a tendency to lose an electron. You will find some amazing properties of elements in a P-block element like gallium. It’s a metal that can melt in the palm of your hand. Silicon is also one of the most important metalloids of the p-block group as it is an important component of glass.
P block elements consist of:
- Group 13 Elements: Boron family
- Group 14 Elements: Carbon family
- Group 15 Elements: Nitrogen family
- Group 16 Elements: Oxygen family
- Group 17 Elements: Fluorine family
- Group 18 Elements: Neon family